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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Daniel Kiper <daniel.kiper@oracle.com>
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Date: Thu, 3 Dec 2020 16:01:47 +0100
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Subject: [PATCH] efi: Add a function to read EFI variables with attributes
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It will be used to properly detect and report UEFI Secure Boot status to
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the x86 Linux kernel. The functionality will be added by subsequent patches.
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Signed-off-by: Ignat Korchagin <ignat@cloudflare.com>
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Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com>
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Signed-off-by: Marco A Benatto <mbenatto@redhat.com>
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Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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(cherry picked from commit ac5c9367548750e75ed1e7fc4354a3d20186d733)
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(cherry picked from commit 51b11f8b3ab96c38efb1636d9c53b5a86503f1f2)
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---
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grub-core/kern/efi/efi.c | 16 +++++++++++++---
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include/grub/efi/efi.h | 5 +++++
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2 files changed, 18 insertions(+), 3 deletions(-)
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diff --git a/grub-core/kern/efi/efi.c b/grub-core/kern/efi/efi.c
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index 335033975d..fccea20a01 100644
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--- a/grub-core/kern/efi/efi.c
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+++ b/grub-core/kern/efi/efi.c
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@@ -242,8 +242,11 @@ grub_efi_set_variable(const char *var, const grub_efi_guid_t *guid,
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}
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grub_efi_status_t
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-grub_efi_get_variable (const char *var, const grub_efi_guid_t *guid,
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- grub_size_t *datasize_out, void **data_out)
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+grub_efi_get_variable_with_attributes (const char *var,
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+ const grub_efi_guid_t *guid,
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+ grub_size_t *datasize_out,
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+ void **data_out,
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+ grub_efi_uint32_t *attributes)
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{
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grub_efi_status_t status;
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grub_efi_uintn_t datasize = 0;
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@@ -280,7 +283,7 @@ grub_efi_get_variable (const char *var, const grub_efi_guid_t *guid,
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return GRUB_EFI_OUT_OF_RESOURCES;
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}
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- status = efi_call_5 (r->get_variable, var16, guid, NULL, &datasize, data);
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+ status = efi_call_5 (r->get_variable, var16, guid, attributes, &datasize, data);
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grub_free (var16);
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if (status == GRUB_EFI_SUCCESS)
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@@ -294,6 +297,13 @@ grub_efi_get_variable (const char *var, const grub_efi_guid_t *guid,
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return status;
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}
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+grub_efi_status_t
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+grub_efi_get_variable (const char *var, const grub_efi_guid_t *guid,
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+ grub_size_t *datasize_out, void **data_out)
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+{
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+ return grub_efi_get_variable_with_attributes (var, guid, datasize_out, data_out, NULL);
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+}
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+
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#pragma GCC diagnostic ignored "-Wcast-align"
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/* Search the mods section from the PE32/PE32+ image. This code uses
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diff --git a/include/grub/efi/efi.h b/include/grub/efi/efi.h
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index 90a85d7d9a..7af979b184 100644
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--- a/include/grub/efi/efi.h
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+++ b/include/grub/efi/efi.h
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@@ -113,6 +113,11 @@ grub_err_t EXPORT_FUNC (grub_efi_set_virtual_address_map) (grub_efi_uintn_t memo
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grub_efi_uintn_t descriptor_size,
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grub_efi_uint32_t descriptor_version,
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grub_efi_memory_descriptor_t *virtual_map);
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+grub_efi_status_t EXPORT_FUNC (grub_efi_get_variable_with_attributes) (const char *variable,
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+ const grub_efi_guid_t *guid,
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+ grub_size_t *datasize_out,
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+ void **data_out,
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+ grub_efi_uint32_t *attributes);
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grub_efi_status_t EXPORT_FUNC (grub_efi_get_variable) (const char *variable,
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const grub_efi_guid_t *guid,
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grub_size_t *datasize_out,
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